Breathless Hindus running for many miles (5)
I believe the answer is:
indus
'for many miles' is the definition.
I can't judge whether this defines the answer.
'breathless hindus running' is the wordplay.
'INDUS' is hidden in amongst the letters.
But, I'm not sure how this is indicated.
Can you help me to learn more?
(Other definitions for indus that I've seen before include "Punjab river" , "Sacred flower" , "Asian runner" , "Long river of Asia" , "River of India and Pakistan" .)